array sampledSet does not check input
Functionality to add/problem to solve
sampling using an 'array' of seed points is not robust.
- not being used in any tutorial
- does not check for pointsDensity having >0 elements only
- uses origin+span instead of centre+bidirectional span
- if coordinateSystem is not specified in dictionary it assumes the 'axis' specification is part of the coordinate system (instead of describing how the output samples should be ordered and output)